$\left(7\right)\left(-30\right)$
$2.3r-1.1r$
$\sqrt{256.121}$
$\int\frac{cosx}{\sqrt{1-senx}}dx$
$5x^2-1+3-8x+2x-3x^2+4x$
$\frac{dy}{dx}=\frac{2x+1}{3y+2}$
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